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Home > Power Generation - Technical Documents 1x200 MW COAL FIRED POWER PLANT/CIVIL WORKS


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Technical Documents 1x200 MW COAL FIRED POWER PLANT/CIVIL WORKS

12  CIVIL WORKS

12.1  Materials

Concrete strength grade should be C10~C40. The grade of steel bars should be HPB235 or HRB335. The grade of steel may be Q235B or Q345B. Materials used in this project shall comply with the requirements of the relevant Chinese Standards and Codes.

12.2  Structure Design

12.2.1  Main Block Area
12.2.1.1  Transversal and Longitudinal Load-carrying Structure System of the Main Block
The main block will be of steel frame structure with bracing. Columns in axis A and the frame of deaerator bay, which are connected with the steel roof truss structure of the turbine hall, compose the transversal load-carrying structure system. The longitudinal load-carrying system, which is composed with the longitudinal steel beams, columns and steel braces between columns, will resist the longitudinal loads. The structure of the main block is isolated from that of boiler house which is designed and produced by the boiler manufacturer.
12.2.1.2  Scheme of the Roof and Floor Structure of Main Block
The roof of turbine hall will be of steel roof truss structure. The purlin will be covered with composite profiled steel sheet. The roof of deaerator bay will be of structural steel beam and reinforced concrete combined floor with profiled steel sheet as bottom formwork. And the roof of boiler house will be designed by boiler manufacturer.
Floors of turbine platform and deaerator bay will be of structural steel beam and reinforced concrete combined floor with profiled steel sheet as bottom formwork.
12.2.1.3  Crane Girder
Steel girders will be provided for the crane.
12.2.1.4  Turbine Generator Pedestal and Foundation
The turbine generator pedestal and foundation will be of cast-in-situ reinforced concrete frame structure.
12.2.1.5  Gable Structure
The gable of the turbine hall is consisted of steel beams, columns and steel bracings between columns. The top of the gable columns is connected with the chord of steel roof truss. The wind load will be transferred to the longitudinal frame of the main block mainly through the steel roof truss.
12.2.2  Boiler Rear Area
12.2.2.1  Stack
Stack will be of single cylindrical reinforced concrete structure, with three inner cores inside. Acid-resistant bricks will be lined internally with the acid-resistant puddle.
12.2.2.2  Flue Support
Flue Support will be of cast-in-situ reinforced concrete frame structure.
12.2.2.3  Forced Draft Fan
Forced Draft Fan will be of cast-in-situ reinforced concrete frame structure.
12.2.2.4  Induced Draft Fan
Induced Draft Fan will be of cast-in-situ reinforced concrete frame structure.
12.2.2.5  Electrostatic Precipitator Foundation
Electrostatic Precipitator Foundation will be of cast-in-situ RC individual foundation under column. The superstructure will be designed and produced by the manufacturer.
12.2.3  Coal System Area
12.2.3.1  Coal Conveyor Gantry
Coal Conveyor Gantry will be of steel truss structure to release self-weight and in favor of construction. The roofing consists of purlin and profiled steel sheet.
12.2.3.2  Transferring Tower
Transferring Tower will be of cast-in-situ reinforced concrete frame structure. The reinforced concrete of building under the ground adopts water-proof concrete.
12.2.3.3  Coal Crusher House
Coal Crusher House will be of cast-in-situ reinforced concrete frame structure.
12.2.3.4  Other buildings in the area
Other buildings in the area, such as Coal handling Building and Coal Sampling House, will be of cast-in-situ reinforced concrete frame structure.
12.2.4  Ash System Area
12.2.4.1  Ash Silo
Ash Silo will be of Cast-in-situ reinforced concrete tube structure.
12.2.4.2  Oil Pipe Rack
Oil Pipe Rack will be of steel structure.
12.2.4.3  Other buildings in the area
Other buildings in the area, such as Ash handling Building, will be of cast-in-situ reinforced concrete frame structure.
12.2.5  Boiler Make-up Water System Area
12.2.5.1  Main Building
Main building, including Boiler Make-up Water Treatment Plant and Chemical Dosing Room, will be of cast-in-situ reinforced concrete frame structure.
12.2.5.2  Minor Building
Minor building, such as unit drainage sump, will be of cast-in-situ reinforced concrete box structure.
12.2.6  Electric System Area
12.2.6.1 Outdoor Switchyard
Outdoor Switchyard will be of steel framework or steel bracket structure.
12.2.6.2  Transformer Foundation
Reinforced concrete foundations will be used for Main Transformer, Standby Transformer and HVAUX Transformer Foundation. Strip footing will be adopted for the transformer railway. Fire barrier shall be settled between transformers.
12.2.7  Accessorial Buildings
12.2.7.1  Accessorial Buildings
Start-up Boiler House will be of steel bent structure.
Other accessorial buildings, including Air Compressor House、diesel oil generator room、Administration Building、Maintenance Building、Material Storage Room�?Fuel Oil Pump House and Guard Room will be of cast-in-situ reinforced concrete frame structure.

12.3  Ground and Foundation

As there is not any information and description about ground, foundations are assumed as individual footing under columns or strip foundations. 

12.4  Civil Architecture

The design includes Main Block, each producing auxiliary and ancillary building in the plant.
12.4.1  Main Block
The Main Block is steel structure. The longitudinal length of the Main Block is 72.0m. The main column spacing is 9.0m.
There will be three rows arrangement in main block. Turbine hall, deaerator bay and coal-bunker bay shall be adopted. The span of turbine hall is 29.0m. The span of deaerator bay is 9.0m, and the coal-bunker bay is 11.5m.
There are three floors in turbine hall: 0.00m(ground floor), 5.00m(middle floor), 10.00m(operating floor),  four floors in deaerator bay: 0.00m, 5.00m, 10.00m, 20.0m, and three floors in coal-bunker bay: 0.00m, 11.00m and 28.50m.  The roofing is steel roof truss and cladding metal sheet. The bridge crane is arranged under the roof truss. The top elevation of the track is 21.10m.
The width of the passage before the boiler is 7m.
The central control building shall be placed behind the main power house. There are three floors.0.00m,5.00m,11.000.
12.4.2  Architectural treatment
It shall be compact and clear, fluent in line, plain and brief in the treatment of elevation in Main Block. Each producing auxiliary and ancillary building shall be shall be harmonized with each other in elevation mould and color. The pressed steel plate shall be adopted in the exterior wall of Main Block.
12.4.3  The architectural finishes
The door includes electric (hand-operated) steel roll-up door, aluminum door, steel plate door, fire resistant door. The windows include aluminum windows.
The Interior emulsion paint is used for interior wall with clay brick and light masonry. The ceramic tile is used for toilet. The acid resist paint is used for chemical room. The 0.00m, 5.00m floor in turbine house is the fine concrete floor. The 9.00m floor is the polished quartz tile floor covering. The polished quartz tile floor covering is used in control room and electronics room etc. and chemical water room is using the quartz tile floor covering (acid resist). The suspended gypsum board ceiling is adopted in control room, electronics room and corridor. The Interior emulsion paint ceiling is adopted in other rooms.
12.4.4  The other main producing building and Accessorial Buildings
The other main producing building includes Air Compressor House, Oil Pump House, Chemical water treatment plant, circling water dosing station, Coal transfer Towers, Crusher Tower, Ash Remover Buildings, shield house, etc.
Accessorial Buildings includes Office Building, Maintenance Workshop, Material Storage Room, and Gate House, etc.

12.5  On-Site Hydraulic Structures

12.5.1  Intake Water  System  Structures

Intake Water pumphouse underground structure shall be reinforced concrete, length × width(net value).=11×11m,depth 8m,with the wall thickness 0.8m, bottom plate thick 1m.
The height of superstructure length × width(axial )= 11×18m,height 11.5m, it shall be reinforced concrete frame structure, brick around.
Scared of hydrological and topographical data, construction method assume cofferdam.

12.5.2  Circulating  Water  System  Structures

12.5.2 .1  Mechanical Draft Cooling Tower

The mechanical draft cooling tower is divided into superstructure and underground structure. The superstructure is measured as 124.6m long by 17.8m wide by 11.4m high(axes values),with metal deck enclosure wall. The superstructure will be a reinforced concrete framework .The underground reinforced concrete structure is measured as 124.6m long by 17.3m wide by 2.3m deep(net values), with 0.25m thick in side wall. bottom plate thick 0.5m.

12.5.2 .2 Compositive water pump house

The underground structure shall be reinforced concrete, length x width(net value).=19.5x7.5m,depth 8m,with the wall thickness 0.8m, bottom plate thick 1m.
The height of superstructure length x width(axial )= 20x19.5m,height 16m, it shall be reinforced concrete bent frame structure, I steel, light weight steel roof, brick around.

12.5.2 .3 C.W. pipe

The main C.W. inlet pipes shall be made of Q235B carbon steel, covered by 35m thick backfill soil. The pipe in dimension is DN1800, the thickness of wall is 12mm, total length is 1000m,rigid rings will be designed by channel steel([12@2500].Outside and inside surface of the pipes shall be treated by tar-epoxy resin.
C.W. inlet pipe inside the C.W. pump house will be made of Q235B carbon steel. The pipe in dimension is DN1400, the thickness of wall is 8mm, total length is 200m,rigid rings will be designed by channel steel([8@2400].Outside and inside surface of  the pipes shall be treated by tar-epoxy resin.

12.5.2  Service Water System Structures

12.5.2 .1 Complex water pump house

The complex water pump house is divided into underground structure and superstructure. The superstructure is measured as 55m long by 12m wide by 8m high (axes values). The superstructure will be a reinforced concrete framework with brick enclosure wall and covered by concrete roof .The pump house shall be decorated as other buildings nearby. The underground reinforced concrete structure is measured as 40m long by 11m wide by 3 m deep (net values).

12.5.2 .2 Service and fire-fighting water pond, 2 sets

The service and fire-fighting water ponds (two sets) ,volume is1000m3 underground reinforced concrete structure, length x width x depth= 22.8×11.4×4.0 (m)(net value).

12.5.3  Sanitary Waste Treatment System Structures

12.5.3 .1 Sanitary waste water adjusting pond, 1 set

The sewage water adjusting pond is length x width x depth=8×6×6 (m)(net value),underground reinforced concrete structure .

12.5.3 .2 Sanitary treatment equipment foundation, 1 set

The equipment foundation is made of C25 reinforced concrete with length x width = 12×5.6(m), height is 0.5(m), covered by 3.5m thick backfill soil.

12.5.4  Other On-Site Hydraulic Structures

There are other auxiliary structures in plant site. They are as follows: 1 set of emergency oil pond, 1 set of 200m3 domestic water pond, 2 sets of 500m3/h mechanism accelerated clarifier tank etc.
 




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